Platform attachment for ladders



F7591. g g

1929. A. A. SILVA 1,725,723

PLATFORM ATTACHMENT FOR LADDERS Filed Feb. 20, 1928 2 Sheets-Sheet l i I 2+ ye 1-?- fi if Inventor" mam -J I fly WM,QJM.CWVM

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Aug. 20, 1929. s v 1,725,723

PLATFORM ATTACHMENT FOR LADDERS Filed Feb. 20, 1928 2 Sheets-Sheet 2 T [22 V672 for:

fittarneys.

Patented Aug. 20, 1929.

ANTONIO A. SILVA, OF BOSTON, MASSACHUSETTS.

PLATFORK ATTACHMENT FOR LADDERS.

Appllcationfiled February 20, 1928.

The invention relates to a new and useful improvement in separable platformv device for attachment to a ladder.

The object of the invention is to provide a platform device which may be attached to the rounds of a ladder on which the workman can stand while painting or doing other work on the wall of a building and which may be moved from one round of the ladder to another according to the elevationdesired by the workman. Another object of the invention is to adapt the device for ladders of different widths.

Referring to the drawings,

Fig. 1 is a front elevation of aladder standing in an inclined position against. a wall and having the device attached thereto.

Fig. 2 is a vertical section on line 2-2 of Fig. 1. v y

Fig. 3 is a plan view of Fig. 1.

Fig. 4 is a perspective view showing the device attached to a ladder in position for use.

Fig. 5 is a perspective view of the platform device embodyin the invention detached from the ladder 51d incollapsed form.

Fig. 6 shows in full lines the platform device adjustedto a ladder of less width, and showing in dotted lines how it is adjusted to a ladder of greater width than that shown in .Fig. 1. i v

In the drawings there is shown at 10 a platform on which the workman is to stand while doing his work and having connected there-'1 with the means for attaching it to the rounds of the ladder.

I Secured to the rear side of the platform 10 are two pairsof hooks 11-11, 12-12, the hooks 11 being adapted to engage over the upper side of any one of the rounds such as 13 of the ladder and the weight of the platform will press the hook 11 down on the round and sustain the weight. The hook 12 is normally spaced a little below the fiiund 13 but is adapted to engage with the under side of the round if the platform is moved up slightly and is, for the purpose of preventing the platform from becoming disengaged by slip ing upwards. Secured to the front part of tiie platform are a pair of short angle -ars 14-44, each having a horizontal arm 14' and j a vertical arm 14". The horizontal arm 14" extends beneath the platform and has a swivel connection therewith by a pivot bolt 9. Said arm 14 extends outward toward the front Serial No. 255,597.

slightly beyond the front edge of the platform and affords clearance between the up right arm 14 and the edge of the platform so that the said angle bar is capable of av slight swiveling movement on the vertical axis of the pivot 9. This also permits the upright arm 1 1 to swivel-with the horizontal arm.

Two brace bars 15-15 are each hinged at 7 one end as shown at 16 to the upwardly ex-- tending branch 14" of the angle bar 14, said bar 15 being inclined upwardly and rearwardly with relation to the upwardly extending bar 14 and at its upper end it is provided with a hook 17 which is adapted to en- .70 gage over the round 19 next abovethe round 13. It is also provided with a hook 18a short distance below the hook 17 which is adapted to engage over the round 19 if the distance. between rounds 13-19 is less than the distance adapted for the use of the hook 17. The hook 18 may also be employed even when the rounds are the same distanceapart. This provision of two sets of hooks 17, 18 allows the ladder to be set at varying an les of inclination and still maintain the p atform in a substantially horizontal plane. There is a very little play between the front edge of the platform and the upwardly extending arm of the angle iron'l l so as to allow a slight swivelling movement of said arm. The pivot connection 16 between the bar 15 and the said upright member of the angle bar 14 allows the upper ends of the brace bars 15 to be turned. toward each other 0 to accommodate them to'a ladder in which the side rails 20 are more narrowly s aced or more widely spaced apart from eac other. It will thus be seen that the? latform is adapted toibe mounted on the la der in connection with any two adjacent rounds to vary the height of the platform from the ground or floor. Also it. is adapted for attachment to ladders of different widths as it is preferable to have the hook connections. with the ladder come 'ust'inside of the side rails. It can be rea il shifted from one position to another. or instance, if the workman desires after finishing his work while standing on the platform as shown in Fig. 1, he can step onto the round below and then easily move the platform down one round, then step back onto the platform without havin to go down to the ground or floor and take own the ladder to make the shift.

of the platform.

What I claim is: a

1. A separable platform attachment for a ladder comprising a platform, hooks attached to the-rear part of the platform and adapted to engage with one of the rounds of a ladder, two supporting rods each having at one end .a swivel connection with the front part of the platform, said rods extending .upwardly and rearwardly from said connection,

the upper ends being free to move toward and from each other to vary the distance be tween them, each of said rods having at its upper-end means for-connectingit with one of the'rounds of the ladder above the rear edge of the platform; I

I 2. A separable'platform attachment for a r a ladder comprising a platform, hooks at} v tached to the rear part of the platform and spaced apart from each other, said hooks being-adapted to engage over one of the rounds of a ladder, two angle bars each of which has a horizontal arm and a vertical arm, the horizontal arm being pivotally connected with the frontpart of said platform whereby said horizontal arms may be swivelled and the upright arms moved therewith,

two supporting rods, each connected at its lower end with the upright portion of sait angle bar by a swivel joint, the upper ends being free to move toward and away from each other, the upper ends of said rods each being provided with means to engage one of the rounds of the ladder at a higher elevation than the round with which the platform hooks are engaged.

"A separable platform attachment for a ladder comprising a platform, hooks attached to the rear part of the platform and,

adapted to engage with one of the rounds of a ladder, two supporting rods each having at its lower end a swivel connection with the front part of the platform whereby they may be turned to vary the distance between their upper ends, said rods extending upwardly' and rearwardly, each of said. -rods havingat its upper end means for connecting it with one of the rounds of the ladder above the rear edge of the platform, said platform being of a substantially greater length than the distance between the said supporting rods.

in testimony whereof I allix my signature. ANTONIO A. SILVA. 

